The former Chelsea boss, who was appointed in May, arrived at the club's Carrington training base to start work in earnest on Monday morning.

This came after he travelled to Manchester by train on Sunday night and told fans, "I am here/UNITED we can" as he arrived.

Mourinho posted this message on his Instagram account along with a video of him stepping off a train at Manchester Piccadilly station.

United have turned to the 53-year-old after parting company with Louis van Gaal at the end of last season.

Van Gaal oversaw FA Cup success but managed only a fifth-placed finish in the Premier League and missed out on Champions League qualification.

Mourinho has had a holiday since his appointment was announced but he has already moved to strengthen his squad by signing former Sweden striker Zlatan Ibrahimovic and Ivory Coast defender Eric Bailly.

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Further signings are likely now the Portuguese is now firmly installed at Old Trafford with talks for Borussia Dortmund playmaker Henrikh Mkhitaryan believed to be nearing a conclusion and other players being linked.

Mourinho, accompanied by goalkeeping coach Silvino Louro, was pictured on Monday leaving the Lowry Hotel in Salford and stepping into a Mercedes people carrier. A vehicle with the same registration was filmed arriving at the AON Training Complex around 30 minutes later.

Mourinho himself was not visible but Press Association Sport understands he is now inside.

A deal for Mkhitaryan is likely to be among one of the first pieces of business Mourinho looks to complete.

Dortmund announced on Saturday the Armenia playmaker was bound for United after they accepted an "enormously valuable offer". Reports suggest this could be around £26million. It is understood personal terms still need to be finalised with the player and a medical undertaken, while the 27-year-old will also need to obtain a work permit.

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The Londoners began the last campaign as champions but he was sacked in December with his side just one point above the relegation zone.

Mourinho is set to be formally unveiled at a press conference on Tuesday before pre-season training begins the following day. They face Dortmund and rivals Manchester City during their pre-season tour of China later this month.